Platen-shift.



M. W. HAZEN.

PLATEN SHIFT.

APPLICATION FILED JUNB3,1909.

/NVE/VTOR mm blomem ATTORNE rs Patented Dec. 15, 1914.-

2 SHEETS-SHEET l I 87 (EL-C 0 E 8 8 M U W M. w. HAZBN. PLATEN SHIFT.

APPLICATION FILED JUNE 3, 19091 1,121,098. Patented Dec. 15, 1914. 2 SHEETS-SHEET 2. 1 46 O J J I g 7 l /f 55 g VII/I/I/IIII) INVENTOR mlUbLovm/w @w'alzzww zz ATTORNEYS UNITED STATES PATENT OFFICE.

MARSHMAN W. HAZEN, OF NEW YORK, N. Y., ASSIGNOR TO CORONA TYPEWRITEB COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

PLATE-N-SHIFT.

Specification of Letters Patent. Patented Dec, 15, 1914.

Original application filed June 23, 1908, Serial No. 439,967. Divided and this application filed June 3, 1909- Serial No. 499,876.

To all whom it may concern Be it known that I, MARSHMAN W. HAzEn, a citizen of the United States, and a resident of New York, county and State of New York, have invented certain new and useful Improvements in Pla'ten-Shifts, of which the following is a full, clear, and exact descriptiiin.

This invention relates more particularly to the platen shifts of visible typewrit ng machines, and is a. division of my pending application, Sr. No. 439,967, filed June 23, 1908.

The primary object of tlie invention is to provide simple and efiicien means for shifting the platen of typewri'ing machines to permit the type-heads to have a plurality of characters thereon in order that the machine may have a comparatively small number of key-levers as compared with the number of type characters; and to provide means by which the platen may be readily shifted to different positions and the said platen positively locked and held so that characters of a certain kind may be used in sequence without shifting the platen each time.

Another object of the invention is to provide a machine in which the platen, carriage and certain other mechanism is adapted to be folded over above the keyboard to make the machine more compact for transportation or for other purposes.

A further object of the invention is to provide simple and efficient platen shift mechanism in which the shift lovers are adapted to elevate the platen, and in which the degree of elevation is determined by the position of an element located convenient to one of the shift levers.

With these and other objects in view, the invention will be hereinafter more particularly described with reference to the accompanying drawings,whieh form a part of this specification, and will then be pointed out in the claims at the end of the description.

In the drawings. l igure 1 is a longitudinal section of one form of typewriting machine embodying my invention, showing certain features of the invention in elevation. Fig. 2 is a longitudinal section of the lower part of the machine looking at the side opposite to that shown in Fig. 1. Fig. 3 is a view similar to Fig. except that the parts are shown me different position; and Fig.

connected by links 13 to the type-bars 14.

These type-bars 14 are pivoted to a bracket 15 at one end and at their other ends have type-heads 16 on which are a plurality of characters indicating the upper case, lower case and figures, and these type-heads are adapted to engage a platen 17 which may be supported to rotate in a carriage 18, the lat-,

ter being moved lengthwise of its bed or support 19.

The carriage 18 is normally forced in one direction by means of a spring carried by a drum 20, located under the carriage bed, and to which a flexible connection, as a cord 21,is connected at one end and atits other end to a part of the carriage so that when the carriage is released by movement of one of the key-levers while printing, the said spring by the actior 'of an escapement mechanism will force the carriage adistance equal to one space as is usual in typewriting machines. The carriage has a rack-bar 22 under the same, and this rack-bar is provided with the usual ratchet-shaped teeth in which is adapted to move the escapement dogs 23 and 2 1 one of which, as 23, is fixed and the other, as 24:, is movable, and said dogs are adapted to permit the carriage to move the distance of a single tooth as usual when the dogs are moved laterally transversely of said rack-bar. The dogs 23 and 24 are carried by an arm 25 which is pivoted to the carriage bed so as to permit said dogs to be moved laterally of said rack-bar allowing the carriage to escape one tooth at a time, the parts thus described being of any preferred construction and operated in any desired manner.

As a means for raising the carriage support and mechanism carried thereby to different heights, to position the platen 17 properly with respect to the upper case characters and the figures on the type-heads or blocks so that the same will properly strike the work held by the platen, and to lock the platen and the mechanism movable therewith in different positions, c'ap shifting lever '26 is provided which has its inner end held loosely to a transverse shaft or rod 27 which rocks in the 'tifachine frame 10. The'lever 26 is extendedinward and has a hooked end engaging a second rod so that the two rods 27 and 28 may move in unlson,

and projecting from the rod 27 is an arm 29in which one end "of the rod 28 is fixed. This arm 29 has a pivotal connection with the rod 30 at its inner end, and said rod at its ends engages the slides. 31 each of which is movable in a bearing 32 located at the upper end of a bracket 33 which'is held to the rear part of the machine frame. As the lever 26-is depressed the rod 30 will raise I 'the slides 31 and lift the carriage bed, platen and mechanism carried thereby. The slides a at the opposite sides-of the machine are held to the supporting members or bars 34 to which the arms 35 projecting from the car-f verse bars or rods 11, and has its inner end connected by a link 37 to the rod 28 and through the latter to an arm 38, the said link being provided with a slot 39 which spans the rod 28 so as to permit a relative independent movement of the rod'and the link. The rod 28 is held in the arm 38, and said arm has its forward end held to the rod 27 and-its rear end pivoted to the transverse rod 30 which operates the slide 31 connect'ed therewith as described in connection with the cap-shift lever 26 and which causes the platen, carriage and mechanism to be elevated, but to a different degree to that ob tained by depressing the shift lever 26.

A bracket or part 40 extends outwardly from the top of one of the slides 31 and said bracket may be fastened to the inner surface of one of the supporting members or arms 34and is adapted to be engaged by a lever or arm 41. This arm is pivoted at 42 to one of the sides of the frame, Figs. 2 to 4, and this lever is normally forced in one direction or toward the key-levers by a spring 43, the upper end of which engages i one of the brackets 33. The upper end of x 55.

the arm 41 is provided with ahead 44, and this head may be provided with two screws 45 and 46, or other means, which are adapted to engage an inturned end 47 of the which has its outer edge beveled, and is bracket or plate 40 to limit the upward movement of the carriage bed, platen and mechanism movable therewith according to the position of said arm 41. This armor lever 41 is provided with a projection 48 adapted to be engaged by the inner beveled end of the figure-shift lever 36 so that when said latter lever is depressed-the inner edge thereof will engage thecam projection 48 and will force the arm 41 inward to place the screw 46 in alinement with the inturned end 47 of the plate or bracket 40, and at Y the same'time that the figure-shift lever is depressed it will elevate the slides '31 through the link 37 and ar'm38 so as to lift the carriage, platen and mechanism movable therewith until the inturned end47 engages the screw 46 or other device, thereby limiting the upward movement of the bracket 40, i I

and as soon as said shift lever is released the parts will return to their normal position. The screws 45 and 46 are employed to permit. nice adjustment and the screw 45 is arranged to normally engage the inturned end 47 of the plate 40. This screw 45 works in connection with the cap-shift lever, and when the latter-operates the transverse rod 30 and the slides 31 'to elevate the support and the means carried thereby, the inturned end of the bracket40 engages the lower .end of the screw 45 thus limiting the upward movement of said slides. The screw 45 is moved inward out of the path of move :1

for the upper-case characters, and a third 1 position when the figure-shift lever 36 is operated, thus properly positioning the platen and the several mechanisms to have the type properly strike the work while printlng.

The carriage, platen and several parts supported by the slides 31 may be locked in either of the elevated positions in which the same is moved by either the cap-shift lever or the figure-shift lever. To effect this -a lock-lever 49 may be employed. This le-.

ver is pivoted at 50 adjacent to the inner,

end of the figure-shift lever 36, and has its lower end, as'51, bent in the form of a hook and provided with two recessed parts 52 and 53 which are adapted to engage the transverse rod 28 or a projection on the arm 38, which is moved by both of the shift levers. As will be seen when the cap-shift lever is operated it will raise the transverse rod 28 a certain distance, and by forcing the locklever 49 downward to theposition shown in full lines in Fig. 3, the recess 52 position.

greater extent so that it may be engaged bv the recess 53 of the lock-lever 48 as shown in dotted lines in Fig. 3, thus 1ocking the slides 31 or elements in its highest By this means the slides and mechanism supported thereby may be elevated to different positionsand be positively locked and rigidly held.

The weight of the carriage may be substantially balanced by means of a spring 54 which \is arranged around the transverse rod or shaft 27. The ends of the spring 54 are fastened to the rod 27, and substantially centrally thereof is provided with a hoo part 55 which is engaged by the end of an adjusting screw 56. adjusting screw 56 may be threaded, and the threaded end may be engaged by a screw nut 57, arranged inthe machine frame at the rear thereof, so that by adjusting the tension of the springjd, the Weight of the carriage and other mechanism to be elevated may be compensated for so that the same may be easily raised.

\Vhile the present invention is limited to the platen shift mechanism and the parts cooperating therewith, other parts of a typewriting machine are shown such as would properly come under the titles of carriages,

escapement mechanism, etc., and such features are either covered in the application hereinbefore referred to or in other divisional and copending applications.

From the foregoing it will be seen that simple and efficient means are provided whereby the platen and carriage may be elevated to different positions and the platen locked in its different positions; that simple means is provided whereby the platen and its support may be folded over above the keyboard without interfering in any way with the mechanism for shifting the platen; that simple means is provided whereby the platen may be locked and held in different positions, and that simple mechanism is provided which is adapted to engage a part of the platen support in such a way that when shifted it will permit the support to be moved to different elevations.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a typewriting machine, the combination with a support, of a platen mounted on the support, two shift levers having relatively different movements for adjusting the platen and support to different heights, a bracket-carried by the adjustable support, a transverse rod to which the shift-levers are connected, means for connecting the transverse rodto the adjustable support, a pivoted arm adapted to engage the bracket when moved by one of the shift-levers to limit the upward movement of the same, and means movable with the other shift-lever adapted ferent movements for ad The outer end of the v to force the arm to a position to permit a further movement of the bracket and thereby the platen and support.

2. In a typewriting machine, the combination with a support, ofa carriage mounted on the support, a platen mounted on the carriage, two shift-levers having relatively 'dif- 'usting the carriage and support, a bracket orming a stop carried by the adjustable support, a transverse rod to which the shift-levers are connected, means for connecting the transverse rod to the adjustable support, a pivoted arm, a spring normally forcing said arm in one direction and adapted to engage the bracket when moved by one of the shift-levers to limit the movement of the same, and means movable with the other shift-lever adapted to force the arm to a position to permit a furthen movement of the bracket and thereby the carriage and support.

3. .In a typewriting machine, the combination with a support, of a platen mounted on the support, two shift-levers having relatively different movements for adjusting the platen and support, a stop movable as the shift levers are operated, a single movable arm adapted to engage the stop when moved by one of the shift-levers to limit the move mont of the same, and means movable with the other shift-lever adapted to force the same arm to a position to permit a further movement of the stop and thereby the platen and support.

at. In a typewriting machine, the combination with a frame, of an upwardly movable support, a carriage mounted on the support, vertically movable means forming a stop, an arm pivoted to the machine frame at one side thereof and having a head provided with two arts for limiting the vertical movement of the support and carriage, a spring normally forcing the arm into position for engaging the means carried by the support to limit the movement thereof, a.

shift le er, and means movable with the shift lever to throw the arm to a position to permit further movement of the support and carriage as the said carriage and support is adjusted.

5. In a typewriting machine, the c0mbi nation with a frame, of a support vertically movable in said frame, a carriage mounted on the support, means carried by the movable support forming a stop, an arm pivoted to the machine frame at one end thereof and r having a head provided with two parts for limiting the vertical movement of the support and carriage, a spring normally forcing the arm into position for engagin the means carried by the support to limit the movement thereof, two shift levers, and means movable with one of the shift levers to throw the arm to a position to permit two movements of the support and carriage as the said carriage and support are-adjusted.

ioo

6 In a typewriting machine, the combination with a frame, of a vertically movable support, a carriagemounted on the support, a platen held to rotate in the carriage, movable means forming a stop, a single arm pivoted to the machine frame at one side thereof and having a head provided with two parts for limiting the vertical movement of the support and carriage, a shift lever for moving the support until the stop engages one part of the head to limit the movement of said support, a second shift lever, and means movable with the latter shift lever to throw the same arm to a po sition to permit further movement of the support and carriage.

7 In a typewriting machine, the combination with a frame, of a support vertically movablein said frame, a carriage -mounted on the support, means carried by the movable support forming a stop, an arm pivoted to the machine frame at one side thereof and having a head provided with two parts for limiting the vertical movement of the support and carriage, a shift lever for moving the support until the stop engages one part of the head to limit the movement of said support, a spring normally forcing the arm into position for engaging the means carried by the support to limit-the movement thereof, a second shift lever, and means operated by the second shift lever to throw the arm to a position to permit further movement of the support and carriage.

8. In a typewriting machine, the combination with a support, of a carriage mounted on the support, two shift levers having relatively different movements for adjustingithe carriageand support to different heights, a bracket carried by the adjustable support,- a transverse rod to which the shift levers are connected, means for connecting the transverse rod to the adjustable support, a pivoted arm, a spring normally forcing the arm in one direction and adapted to engage the bracket when moved by one of the levers to limit the upward movement of the same, means movable with the other lever adapted to force the arm to a position to permit a further movement of the bracket and thereby the carriage and support, together with means for locking the support and carriage in its different adjusted positions.

9. In a typewriting machine, the combination with a support, of a platen mounted on the support, two shift levers for adjusting the platen and support to different heights, a bracket carried by the adjustable support, a transverse rod to which the shift levers are connected, means for connecting the transverse rod to the adjustable! support, a pivoted arm adapted to engage the shift levers and support and platen.

bracket when movedby one of the levers to limit the upward movement of the same, means movable with the other lever adapted to force the armto a position to permit a further movement of the bracket and thereby the carriage and support, together with means for locking the support and platen in its adjusted position.

' 10. The combination with'a verticallyadjustable support, and means for moving the its different adjusted positions,

port to different distances, an arm normally independentof the movementof one of the 7 adapted to engage a part of the suportto limit its movement, said arm being provided with other means to engage on its pivot, and means operated by the second shift lever for shifting the position of the support when the arm has been shifted the arm to permit a furthervertical movement of the support and platen.

12. In a typewriting machine, the combination with an adjustable support, of a platen mounted on said support, two shift levers for independently adjusting the platen and support, an arm normally independent of the movement of one of the shift levers and adapted to engage a part of the support to limit its movement, said arm being provided with other means to engage the support when the arm has been shifted on its pivot, and means operated by the second shift lever for shifting the position of the arm as a further movement is given to the 13. In a typewriting machine, the combi nation with a frame, of a vertically movable support, a carriage movably held on said support, a platen mounted on said carriage, slides engaging the support and vertically movable in the machine frame, a transverse rod connecting the slides together, a shift lever connected to the transverse rod for elevating the same a certain distance, a pivotally held arm connected to the transverse rod adjacent to the other slide, a second'shift lever, a link connecting said shift lever at one end to said arm,

said lever having an inner-projecting beveled end, a pivotally held arm having a head provided with two differently positioned engaging parts adaptedto engage a part of the supportin its vertical adjustment and independent of the movement of one of the shift levers, and means carried by the arm adapted to be engaged by the second shift lever to move the same on its pivot and thereby one of. the engaging parts of said arm out of: the path of movement of the support and to permit the other engaging part to engage part -of said support to permit said support t have two distinct adjustments according to which shift lever is operated.

14. In. a typewriting machine, the combination with a frame, of a vertically movable support, a platen movably held on said support, slides engaging the support and vertically movable in the machine frame, a transverse rod connecting the slides together, a shift lever connected to the transverse rod for elevating the same a certain distance, a pivotally held arm connected to the transverse rod adjacent to the other slide, a second shift lever, a link connecting said shift lever at one end to said arm, said second shift lever having an innerprojecting beveled. end, and a pivotally held arm having a head provided with two differently positioned. engaging parts adapted to engage a part of the support in its vertical adjustment and independent of v the movement of one of the shift levers but movable by the other.

15. In a typewriting machine, the combination with a frame, of a vertically mov able support, a platen movably held on said support, slidesengaging the support and vertically movable in the frame, a transverse rod connecting the slides together, a shift lever connected to the transverse rod for elevating the same a certain distance, a second shift lever, means connecting said second shift lever at one end, to the transverse rod, said lever having an inner projecting beveled end, and a pivotally held arm having a head provided with two differently positioned engaging parts adapted to engage a part of the support in its vertical adjustment and to be operated by the beveled end of the second shift lever.

16. In a typewriting machine, the combination with a frame, of a vertically movable support, a platen movably held on said sup port, slides engaging the support and vertically movable in the machine frame, a transverse rod connecting. the slides together, a shift lever connected to the transverse rod for elevating the same a certain distance, apivotally held arm connected to the transverse rod adjacent to one of the slides, a second shift lever, a link connecting said second shift lever" at one end to said arm, said second lever having an inner projecting beveled end, and a pivotally held am having a head provided with two differently positioned engaging surfaces adapted to en age a partiof the supportin its vertical ad ustment and having an. outwardly projecting part provided with a beveled surface adapted to be engaged by the beveled end of the second shift lever.

17. In a typewriting machine, the combination with a support, of a platen mounted on the su port, two shift levers having relatively different movements for ad usting the platen to different heights, a transverse rod to which the shift levers are connected, means for connecting the transverse rod to move the laten, a pivoted arm, a spring normally orcing the arm in one direction, said arm being adapted to limit the move ment of the platen, and means movable with one of the shift levers adapted to force the arm to a position to permit a further movement of the platen and then stop the same.

18. In a typewriting machine, the combination with a support, of a platen mounted on the support, two shift levers having relatively different movements for adjusting the platen and support to different degrees, and a single movable arm adapted to engage a part ofthe support to limit its movement, and movedfby one of the shift levers to permit further-movement of the support and then stopits second movement.

19. In a typewriting machine, the combination with a support, of a platen mounted on the support, two shift levers having relatively different movements for adjusting the platen and support, a transverse rod to which, the levers are connected, means for connecting the transverse rod to the adjustable support, an arm adapted to engage :1

art of the support when the latter is moved y one of the levers to limit the movement of the same, and means movable with the other lever adapted to force the arm. to a position to permit a further movement of the support and thereby the platen mounted on the support.

20. In a typewriting machine, the combination with an adjustable platen, of a plurality of shift levers having. relatively different movements for adjusting. the platen, and a single movable arm adapted to permit a limited movement of the platen when the latter is shifted by one of the levers and a further movement when shifted by a second lever.

21. In a typewriting machine, the combination with a movable platen, of a movable arm having a head provided with two parts for limiting the movement of the platen, a spring normally forcing the arm in one direction to permit a limited movement of the platen, two shift levers, and means whereby one of the shift levers will throw the arm to a position to permit a more extended movement of the. platen.

22. The combination with a vertically adjustable support, .and means for moving the same, of a platen mounted on said support, and a pivotally held arm provided with a head having two adjusting screws located in relatively different positions. and adapted to serve as a stop for the support in its different adjusted positions. 23. In a typewriting machine, the combination with a support, of a platen mounted onthe support, a transversely-extending rod, two arms held. to the rod, means for connecting the rod to move-the platen, a second transversely-extending rod connecting the arms together, two shift levers independdifferent distances, and apivotally held arm for limiting the distance- 'theplaten is moved. a I

25. In a typewriting machine, the combination with: a support, of. a platen mounted on the support,-- a transversely-extending rod, two arms held'to the rod, means for connecting the rod to the support, a second transversely-extending rod connecting the arms together, two shift levers independently connected to the second rod adapted to move the arms and thereby the platen to relatively different. distances, and a piv otally held arm for limiting the distance theplaten is moved.

26. In a typewriting machine the combination with a support, ofa-platen mounted on the'support, two pivotally held arms,

means connectingthearms .to each other and to'the support a f shift lever directly connected to move the arms, asecond shift lever, a link pivotally held at one end to the second shift lever and having a slotted connection with the arms to 'permit'the platen to be moved independently by the shift lever, an arm adapted to engage a part of the support and limit the movement of the platen when one of the shift levers is operated, and means whereby the said latter arm may beoperated by the other shift lever to permit a second and further movement of the platen and to limit said further movement.

27. In a typewriting machine, the combination with a support, of a platenmounted on the support, a pivotally held-arm, a shift lever directly connected to move the arm, a second shift lever, a link pivotally held at one end to the second shift lever and having slotted connection with the arm to permit i the platen to be moved independently by the first shift lever, and means for limiting the movement of the platen. 28. In a typewriting machine, the combination with a support, of a platen mounted on the support, two pivotally held arms, means connecting the arms to each other and to the support, a shift. lever directly connected to move the arms, a second shift lever, a link pivotally held at one end to the second shift lever and having a slotted con nection with the arms to permit the platen to be moved independently by the first shift lever, and means for limiting the movement of the platen. 29. In a typewriting machine, the combination with a platen of two pivotally held arms, means connecting the arms to each other and to move the platen, a shift lever directly connected to move the arms, a second shift lever, a link pivotally held at one end to the second shift lever and having a slotted connectionwith the arms to permit the platen to be ;moved independently by the shift levers, an arm having a projection provided with a beveled end a dadapted to limit the movement of the plgten' when one I of the shift levers is operated, and means carried bythe second shift lever for engaging the projection on the arm whereby the said arm mayfbe operated by the second shift lever to permit a further movement of the platen and to limit said further movement.

30. In a typewriting machine, the combination with a frame, of a support adjustably held on said frame, a platen mounted on the support and movable therewith, a transverse bar, means for operating the transverse bar to adjust the support to twodistinct positions, and a lock lever substan tially angular in form and pivotally held to the frame at one side thereof having a finger piece and adapted 'to engage a part of the frame, said leverhaving a hooked inner end adapted to engage said rod and thereby hold and lock the support in its adjusted positions.

31. vIn a typewriting machine, the combination with a frame, of a vertically adjustable support held on said frame, a platen mounted on the support and movable therewith, a transverse bar, means for operating the transverse bar to adjust the support to two distinct positions, and a lock lever substantially angular in form and pivotally held to the frame at one side thereof, and having a hooked inner end adapted to engage said rod and thereby hold and lock the support in its adjusted position.

32. In a typewriting machine, the combir provided with two recessed portions adaptsingle (pivotally held lever having means adapte to hold the support in either of its adjusted positions.

33. In a typewriting machine, the combination with a support, of a carriage mounted on said support, two shift levers imparting relatively different movements to said support in the same direction, a transversely extending shaft movable with the shift levers, and a single pivotally held lever havin means adapted to engage the shaft and hoId the support in either of its adjusted positions.

34. In a typewriting machine, the combination with a vertically adjustable support, of a carriage mounted on said support, two shift-levers imparting relatively difi'erent movements to said support in the same direction, and a single lever pivotally held to the side of the machine intermediate the ends of the shift levers and adapted to hold the support in either of its adjusted positions.

35. In a typewriting machine, the combis nationwith a vertically adjustable support, of a carriage mounted on said support, two

shift levers imparting relatively different movements to said support in the same difraction, and a sin le manually operated lever independent of the shift levers and pivotally held to the side of the machine intermediate the ends of the shift leversand having 8 aced means to hold the support in either 0 its adjusted positions.

36. In a typewriting machine, the combination with a vertically adjustable support, of a carriage mounted on said support, two shift levers imparting relatively different vertical movements to said support in the same direction, a transversely-extending rod operatively connected to said levers, and a pivotallv held single lever having one end ed to engage the end of the rod in its adjustment through the shift lovers to hold the support movable thereby in either of its adjusted positions.

37. In a typewriting machine, the combination with a vertically adjustable support, of a carriage mounted on said support, two shift levers imparting relatively different vertical movements to saidsupport in the same direction, a transversely-extending rod operatively com'iccted to said levers, and an angular pivot-ally held lever entirely independent of the shift levers having one end provided with two recessed portions adapted to engage the end of the rod in its adjustment through the shift levers to hold the suport movable thereby in either of its adjusted positions.

38. In a typewriting machine,the combination with a support, of a platen mounted on said support, a transversely-extendlng rod, arms held to the rod and connectedto the support, a plurality of shift levers independent of the arms, means whereby the shift levers may be made to operate the arms and impart different degrees of movement to the platen, a spring tending normally to lift the support and platen, a rod connected-to the spring, and a screw engaging the rod. whereby the tension of the spring may be varied and the weight of the support and platen compensated for.

39. In a typewriting machine, the combination with a support, of a platen mounted on said support, a transversely-extending rod, arms held to the rod and connected to the support, a plurality of shift levers independent of the arms, means whereby the shift levers may be made to operate the arms and impart different degrees of movement to the platen, a spring surrounding the rod and tending normally to lift the support and platen, a rod connected to the spring and a screw engaging the rod whereby the tension of the spring may be varied and the weight of the support and platen compensated for.

40. In a typewriting machine, the combination with a support, of a platen mounted on said support, a transversely-extending rod, means connected to the shaft for elevating the support and platen, a spring surrounding the rod and tending normally to lift the support and platen, a rod connected to the spring, and a screw engaging one end of the rod for adjusting the same to vary the tension of said spring.

41. In a typewriting machine, the combination with a support, of a platen mounted on said support, a transversely-extending rod, means connected to the rod for elevating the support and platen, a spring surrounding the rod and tending normally to -MARSHMAN W. HAZEN;

Witnesses:

IV; A. TOWNER, Jr., M; DINNHAUPTII Copies of this patent may be obtained for live cents each, by addressing the Commissioner of .Patents.

Washington, D. 0." 

